<!--
 * @Descripttion: 
 * @version: 
 * @Author: 冉勇
 * @Date: 2021-09-06 22:36:19
 * @LastEditTime: 2021-09-09 00:07:02
-->
<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 侧边栏菜单区 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
        <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{ subItem.authName }}</span>
            </el-menu-item>
            </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
      // 左侧菜单数据
      menulist: [],
      // 一级菜单图标
      iconsObj: {
        '125': 'iconfont icon-RectangleCopy4',
        '103': 'iconfont icon-RectangleCopy6',
        '101': 'iconfont icon-RectangleCopy2',
        '102': 'iconfont icon-RectangleCopy3',
        '145': 'iconfont icon-RectangleCopy7'
      },
      // 初始值是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  // 定义一个生命周期函数
  created() {
    this.getMenuList(); // 调getMenuList来获取所有菜单
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear();
      // 路由跳转到login页面
      this.$router.push("login");
    },
    // 获取所有的菜单
    async getMenuList(){
      const { data:res }= await this.$http.get('menus');
      if(res.meta.status !== 200) return this.$message.danger('获取菜单列表失败');
      this.$message.success(res.meta.msg);
      this.menulist = res.data;
      console.log(res.data);
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = ! this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #838b91;
  display: flex; // 弹性布局
  justify-content: space-between; // 弹性容器中平均分布
  padding-left: 0; // 左内边距
  align-items: center; // 弹性盒子元素在该行的(纵轴)居中位置
  color: #fff;
  font-size: 20px;
  > div {
    display: flex; // 弹性布局
    align-items: center; // 弹性盒子元素在该行的(纵轴)居中位置
    span {
      margin-left: 0.3rem;
    }
    img {
      height: 60px;
      max-width: 100%;
      margin-left: 0.1rem;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;  // 设置字符之间的空白
  cursor: pointer;  // 鼠标放上去就变成小手
}
</style>